Measuring instrument.



R. W. STEBD.

MEASURING INSTRUMENT.

nrmouxon rum) mm. 11, 1912.

1,109,479. Patented Sept 1, 191% ZSHEETS-SHEBT 1.

. I "I F-' I 0 jaw/Steed;

TNF NORRIS PETERS CO. PHbTU-LITHOH WASHINGTON. D, C.-

R. W. ST EED.

MEASURING INSTRUMENT.

APPLICATION FILED nm'u, 1912.

1,109,479. v v 5 Patnted Sept. 1, 1914-.

Z SHEETS-$1122! 2.

12,,WJieed.

THE NORRIS PETERS c0. PHO TgrLiTHQ. WASHINGTON, n. C

. I f RALPH 5w. srnnmor mamas, NDIANA.

a nwh m.abrea t Be it known that I, ,RAL1 H W. STE n, a

1 citizen oi;- the United-[states residin at Portland, in the countyfotJay, State"o Indiana, have invented certain new and useful Improvements1n -Measur'1'ng Instruments;

in the art to which: it appertains to make hduse the same s This;invention'relates tot measuring A I v sivelylfrom the arm 10 to the arm13' and;

struments.

, Theobject ofinvention residesin provision of a measuring instrumentWhlCh may be utilized with facility in, efi'ecting a division-of givenangles into adesired num- ,ber-of equal parts without resorting to anymathematical computation or any geometr1- calprocessr i1 I V A furtherobject of the invention resides in the provision" of ameasurininstrument of the characterfreferred to w ich ma be utilized withfacilityin .drafting,;buil ing,

plottin i and various other lines of mechaniwit the above an'diotherobjects inview, the invention consists -,inithedetai1s of constru'ctionand'in the arrangement and com.- binationof parts to be hereinaftermore" full described and particularly pointed out in t e. appendedclaims.

In describing the invention in detail, reference will be had to theaccompanying drawings wherein like characters of reference denotecorresponding parts in the several views, and in which.-

Figure 1 is a plan. view of an instrument" 1 constructed in accordancewith the inven 7 tion, same being shown inan expandedstate and of a typeadapted to effect the division of an angle into three equal parts,Fig.2,

1 a side elevation of the instrument, same being shown in afoldedstatey'Fig. 3, a section on the line 3+3 of Fig. 1, Fig; 4, a viewsimilar to Fig. 1 with the various parts'of the instrument indicated bysingle lines so as to disclose more'clearly the geometricalprincipleupon which the operation of thev instrument is based, and, Fig..5,a plan. view of an instrument constructed in accordance with theinvention, and adapted to be utidivision of a given.

liZed inrefi'ecting the i an le into fivediflerent arts. eferring to thedrawings, the instrument firms mama msrxmnr.

'; Which are pivotally Y Patented Sept. 1, 19:14.

e arms are moved on their com-- armslO, and 13 willbe disposed soas tocons.

fine thexarms 11 and 12 therebetween, said arms 10- and 13 constitutingthe limiting 'arms and the arms 11 and 12 the intermediate arms of theinstrument. The arms of the, instrument decrease in length succeseachgot the arms has mounted in its free end a marker 15- the marking pointsbeing all: disposedfin the sameplane so that when.

the instrument is. applied to a given piece ;of. work. the marker 15 in.conjunction with the pivot pin '14 support the instrument level. Theintermediate arms 11 and 12 are provided respectively with longitudinalslots 5 outer ends of connectingtlinks 19 and 2 0 dis-.

posed; respectively on op osite sides of the arm 11,. said Iinks19' an20 being e l inlength- The inner end of the link 19 1s pivotallyconnected at 21 to the limiting arm 10, while the inner endof the link20 is 'pivotallyconnectc-d to the intermediate arm' 12 at 22,fsaidpivotal connections- 21 and 22 being disposed equal distances from thepivot pin 141. Passing through and slidable in the slot 17 is a pivot.pin 2 3 to which are pivotally connected the outer endsof Links 24" and25 disposed respectively on opposite sides of the arm 12. The inner endof the link are ivotally connected tbthe 11 at; 26', whi e the inner endof the link 25 is pivotally connectedto the limiting arm 13 at 27.; andboth of'the pivotal connections is shown asjcomprising a plurality ofarms 1 '10, '11, 1 2 and 13 corresponding ends of 7 connected togetherby:

a suitable ivot pm; 14. It will be noted. that whenv men, pivot-so as tolie in juxtapositionthe' 26 and .27 are disposed the same distance fromthe pivot pin "14 as the pivotal connections 21 and 22.

In the use of the instrument the pivotal connection 14 is placedv uponthe apex of theangleit is desired to divide and the marking points 15 ofthe limiting arms 10 and 13 positioned on the respective sides of theangle.- ,With the instrument in this relation to the angle to be dividedthe points 515 ofthe arms 11 and 12 are impressed into the work so as toproduce the desired mark.

Lines are then drawn connecting the apex 19, 20, 24 and 25 of theinstrument. Now,

in the triangles EGO and E10, GO=IO, GEzIE, and E is common. Thereforethe angleGOE=EOL Again, in the triangles rno and mo, HO:JO, FHzFJ, and

F0 is common, therefore the angle HOF :the-angle J OF. As the angle HOFis the same angle as EOI the angle GOE the angle J OF and the angle AODis divided into three equal parts by the lines 130 and CO.

In the modified form of instrumentillustrated in Fig. there are employedfour intermediate arms between the limiting arms 10 and 13. In all otherrespects the construction. and principle involved in the instrumentshown in 5 is identical with that previously described in connectionwith the instrument shown in Fig. 1. By utilizing four intermediatearms'30 in the modified form of instrument it will be obvious that samemay be utilized to divide an angle into five equal parts.

Referring to Fig. 1 and Fig. 5 it will be noted that one of the links 21 is provided with an ofiset portion 24, while certain of the links inFig. 5 are provided with offset portions 31. These offset portions areadapted to receive an adjacent pivot pin whereby'the instrument may befolded to dispose the arms and links one. above the other with theirlongitudinal axes in a common plane.

While two forms of the instrument have been shown and described it willbe apparent that the principle involved may be extended indefinitely soas to produce an instrument adapted to effect the division of an angleinto any desired number of equal parts.

What is claimed is:

1. An instrument of the class described comprising a pair of limitingarms and a plurality of intermediate arms, a pivot pin connectingcorresponding ends of said limiting and intermediate arm, said pin being extended atone end to form a point, pins mounted in the free ends ofthe limiting and intermediate arms having their outer ends disposed in acommon plane with the outer end of the pivot pin, and means operated bythe movement of the limiting arms toward and away from each other forsimultaneously altering the position of the intermediate arms toconstantly maintain the angles between adjacent intermediate arms andbetween the limiting arms and adjacent intermediate arms equal.

2. An instrument of the class described comprising a plurality of armshaving cor- 'and certain of said links being provided with offsetportions for receiving an adjacent pivot pin whereby the instrument maybe folded to dispose the arms and links one above the other with theirlongitudinal axes in a common plane.

In testimony whereof, I allix my signature, in presence of twowitnesses.

RALPH IV. STEED.

Witnesses JAMES H. STEED, OLIVER K. STEED.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

- I Washington, D. G.

